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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Cc: Mathias Nyman <mathias.nyman@intel.com>,
	Felipe Balbi <balbi@kernel.org>, Rob Herring <robh+dt@kernel.org>,
	Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>,
	Pavel Parkhomenko <Pavel.Parkhomenko@baikalelectronics.ru>,
	Andy Gross <agross@kernel.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Manu Gautam <mgautam@codeaurora.org>,
	Roger Quadros <rogerq@ti.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>,
	Neil Armstrong <narmstrong@baylibre.com>,
	Kevin Hilman <khilman@baylibre.com>,
	linux-usb@vger.kernel.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 02/18] dt-bindings: usb: usb-hcd: Add "wireless" maximum-speed property value
Date: Mon, 12 Oct 2020 17:41:50 +0200
Message-ID: <20201012154150.GA1565332@kroah.com> (raw)
In-Reply-To: <20201011175333.2v46x6kiugqnvlpk@mobilestation>

On Sun, Oct 11, 2020 at 08:53:33PM +0300, Serge Semin wrote:
> On Sun, Oct 11, 2020 at 04:42:36PM +0200, Greg Kroah-Hartman wrote:
> > On Sun, Oct 11, 2020 at 01:41:05AM +0300, Serge Semin wrote:
> > > It appears that the "maximum-speed" property can also accept the
> > > "wireless" value. Add it to the enumeration of the possible property
> > > values then.
> > > 
> > > Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
> > > ---
> > >  Documentation/devicetree/bindings/usb/usb-hcd.yaml | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/usb/usb-hcd.yaml b/Documentation/devicetree/bindings/usb/usb-hcd.yaml
> > > index 815de24127db..e1a82a2b3295 100644
> > > --- a/Documentation/devicetree/bindings/usb/usb-hcd.yaml
> > > +++ b/Documentation/devicetree/bindings/usb/usb-hcd.yaml
> > > @@ -28,7 +28,7 @@ properties:
> > >       isn't passed via DT, USB controllers should default to their maximum HW
> > >       capability.
> > >     $ref: /schemas/types.yaml#/definitions/string
> > > -   enum: ["low-speed", "full-speed", "high-speed", "super-speed",
> > > +   enum: ["low-speed", "full-speed", "high-speed", "wireless", "super-speed",
> > >            "super-speed-plus"]
> > 
> 
> > Are you sure?  wireless usb has been removed from the kernel, where do
> > you see a user of this?  If it's still in there, we need to just drop
> > it.
> 
> My decision on suggesting this patch has been based purely on the speed types
> the USB core API supports and what usb_get_maximum_speed() can return.
> USB_SPEED_WIRELESS type is one of the possible return values. As I can see
> aside the rest of the USB speeds the wireless speed is also defined
> in the kernel USB subsystem. Moreover it is used in some kernel drivers.
> (See the USB_SPEED_WIRELESS enumeration constant usage.)
> Are you sure that the wireless speed support has been really removed?

All of the drivers that implement and support this should have been
removed.  Code in the USB core is probably not removed, but patches are
gladly welcome.

Please do not add new wireless support as it is not going to happen,
because there are no wireless devices in the world.

thanks,

greg k-h

  reply index

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-10 22:41 [PATCH 00/18] dt-bindings: usb: Add generic USB HCD, xHCI, DWC USB3 DT schema Serge Semin
2020-10-10 22:41 ` [PATCH 01/18] dt-bindings: usb: usb-hcd: Convert generic USB properties to " Serge Semin
2020-10-13 12:14   ` Rob Herring
2020-10-13 14:00     ` Serge Semin
2020-10-10 22:41 ` [PATCH 02/18] dt-bindings: usb: usb-hcd: Add "wireless" maximum-speed property value Serge Semin
2020-10-11 14:42   ` Greg Kroah-Hartman
2020-10-11 17:53     ` Serge Semin
2020-10-12 15:41       ` Greg Kroah-Hartman [this message]
2020-10-12 21:19         ` Serge Semin
2020-10-10 22:41 ` [PATCH 03/18] dt-bindings: usb: usb-hcd: Add "otg-rev" property restriction Serge Semin
2020-10-10 22:41 ` [PATCH 04/18] dt-bindings: usb: usb-hcd: Add "ulpi/serial/hsic" PHY types Serge Semin
2020-10-11  8:49   ` Sergei Shtylyov
2020-10-11 18:03     ` Serge Semin
2020-10-10 22:41 ` [PATCH 05/18] dt-bindings: usb: usb-hcd: Add "tpl-support" property Serge Semin
2020-10-11  8:47   ` Sergei Shtylyov
2020-10-11 18:05     ` Serge Semin
2020-10-11 18:06     ` Serge Semin
2020-10-10 22:41 ` [PATCH 06/18] dt-bindings: usb: usb-hcd: Add generic "usb-phy" property Serge Semin
2020-10-10 22:41 ` [PATCH 07/18] dt-bindings: usb: Convert xHCI bindings to DT schema Serge Semin
2020-10-13 12:30   ` Rob Herring
2020-10-13 14:29     ` Serge Semin
2020-10-10 22:41 ` [PATCH 08/18] dt-bindings: usb: xhci: Add Broadcom STB v2 compatible device Serge Semin
2020-10-10 22:41 ` [PATCH 09/18] dt-bindings: usb: renesas-xhci: Refer to the usb-xhci.yaml file Serge Semin
2020-10-10 22:41 ` [PATCH 10/18] dt-bindings: usb: Convert DWC USB3 bindings to DT schema Serge Semin
2020-10-13 12:36   ` Rob Herring
2020-10-13 15:16     ` Serge Semin
2020-10-10 22:41 ` [PATCH 11/18] dt-bindings: usb: dwc3: Add interrupt-names property support Serge Semin
2020-10-11  8:53   ` Sergei Shtylyov
2020-10-11 18:09     ` Serge Semin
2020-10-10 22:41 ` [PATCH 12/18] dt-bindings: usb: dwc3: Add synopsys,dwc3 compatible string Serge Semin
2020-10-10 22:41 ` [PATCH 13/18] dt-bindings: usb: dwc3: Add Tx De-emphasis restrictions Serge Semin
2020-10-11  8:56   ` Sergei Shtylyov
2020-10-11 18:14     ` Serge Semin
2020-10-10 22:41 ` [PATCH 14/18] dt-bindings: usb: dwc3: Add Frame Length Adj restrictions Serge Semin
2020-10-13 12:38   ` Rob Herring
2020-10-13 15:45     ` Serge Semin
2020-10-10 22:41 ` [PATCH 15/18] dt-bindings: usb: meson-g12a-usb: Discard FL-adj property Serge Semin
2020-10-12  7:54   ` Neil Armstrong
2020-10-12 14:22     ` Serge Semin
2020-10-12 15:01       ` Neil Armstrong
2020-10-12 15:13         ` Serge Semin
2020-10-12 15:29           ` Neil Armstrong
2020-10-10 22:41 ` [PATCH 16/18] dt-bindings: usb: meson-g12a-usb: Validate DWC2/DWC3 sub-nodes Serge Semin
2020-10-12  7:38   ` Neil Armstrong
2020-10-13 12:42   ` Rob Herring
2020-10-13 15:50     ` Serge Semin
2020-10-10 22:41 ` [PATCH 17/18] dt-bindings: usb: keystone-dwc3: Validate DWC3 sub-node Serge Semin
2020-10-11  9:04   ` Sergei Shtylyov
2020-10-11 18:18     ` Serge Semin
2020-10-10 22:41 ` [PATCH 18/18] dt-bindings: usb: qcom,dwc3: " Serge Semin

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